We go to Microsoft 365 admin center>Settings>Service & adins> Microsoft Forms, turn off all 4 fields in external sharing. Then goes to Settings in form survey creation, now we can click on Anyone with the link can respond button which was greyed out previously. We know it works, meaning that external user cannot access from the link where Microsoft Forms external sharing is off even if they try, but if can you bring back older version in which Who can fill out this form field was greyed out so that users have better understanding external sharing is not allowed.

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